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Old 07-15-2020, 12:13 AM   #1
aldogg7
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Join Date: Apr 2015
Location: Pullman
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Default Odor after differential oil change

A couple of months ago I changed my differential (25% limited slip option) oil with Redline 75W-90. After driving it, I noticed the sulfur odor of the oil when the windows were open. I figured it was just the oil that dripped out of the fill plug that was burning off the casing. But the odor still persists a few months later. I see no signs whatsoever of a leak, even after a thorough cleaning of the rear end. The odor is strongest when accelerating in gears 2-4, and dissipates after maintaining speed for a minute or so.

I also changed manual transmission fluid at the same time, but I do not think the odor is that oil.

Could this be normal after a differential oil change? I doubt the oil had ever been changed before (1995, 116k miles). Any ideas where I could look for potential leaks? Also seems strange that I only smell the odor when windows are down and not through the HVAC.

Thank you for any advice!!
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